diff --git a/src/Handler/Utils/Profile.hs b/src/Handler/Utils/Profile.hs
index cc823a019..22f7a8098 100644
--- a/src/Handler/Utils/Profile.hs
+++ b/src/Handler/Utils/Profile.hs
@@ -82,12 +82,12 @@ validPostAddress _ = False
 
 -- also see `Handler.Utils.Users.getEmailAddress` for Tests accepting User Type
 validEmail :: Email -> Bool      -- Email = Text
-validEmail email = validRFC5322 -- && not invalidFraport
+validEmail email = validRFC5322 && not invalidFraport
   where 
     validRFC5322 = Email.isValid $ encodeUtf8 email
-    -- invalidFraport = case Text.stripSuffix "@fraport.de" email of  
-    --   Just fralogin -> all isDigit $ drop 1 fralogin
-    --   Nothing       -> False
+    invalidFraport = case Text.stripSuffix "@fraport.de" email of  
+      Just fralogin -> all isDigit $ drop 1 fralogin
+      Nothing       -> False
 
 validEmail' :: UserEmail -> Bool -- UserEmail = CI Text
 validEmail' = validEmail . CI.original